1. CO2 abatement and CH4 recovery at vehicle exhausts: Comparison and characterization of Ru powder and pellet catalysts.
- Author
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Murena, F., Esposito, S., Deorsola, F.A., Galletti, C., and Prati, M.V.
- Subjects
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MONOLITHIC reactors , *X-ray powder diffraction , *METHANATION , *WOOD pellets , *TEMPERATURE-programmed reduction , *CATALYSTS , *PELLETIZING , *PARTICLE emissions - Abstract
The catalytic conversion of CO 2 to CH 4 (Sabatier reaction) has been studied to develop an after-treatment process at vehicles exhausts. Three different formulations of Ru commercial catalysts, two in powder and one in pellets shape, were tested and characterized by means of X-ray powder diffraction, scanning electron microscopy (SEM-EDX), N 2 adsorption at −196 °C and temperature-programmed reduction (TPR). Experimental results show a high CO 2 conversion (X CO2 = 0.96 @ T = 280 °C) for one powder catalyst formulation whereas the other one has maximum CO 2 conversion = 0.69. In both cases a high CH 4 selectivity is measured. High CO 2 conversion (X CO2 = 0.92 @ T = 300 °C) is obtained also with pellet catalysts but only at lower GHSV values. The different behavior of the catalysts was ascribed to the different physicochemical properties and the key parameters for the application development of the process were identified. In particular, the possibility to use pellets or monolithic reactors, thus minimizing the pressure drops in the reactor, makes possible a commercial application in the treatment of vehicles exhausts. • Ru catalysts guarantee high CO 2 conversion to CH 4 even in pellet shape. • Ru content can be limited to 1.5 wt% for a thickness of 0.5 mm on catalyst surface. • Catalyst performances make it possible the application of monolithic reactors. [ABSTRACT FROM AUTHOR]
- Published
- 2020
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